Method for producing thermoplastic resin composition, thermoplastic resin composition, and molded article

Patent metadata

Field	Value
Publication number	US-9290662-B2
Application number	US-201113819202-A
Country	US
Kind code	B2
Filing date	Oct 18, 2011
Priority date	Oct 20, 2010
Publication date	Mar 22, 2016
Grant date	Mar 22, 2016

Abstract

The present invention provides a thermoplastic resin composition which is produced by a method which includes melt-kneading: (a) a polyphenylene sulfide resin, with (b) a polyetherimide resin or a polyethersulfone resin. The thermoplastic resin composition contains 99 to 1% by weight of the component (a) and 1 to 99% by weight of the component (b) based on 100% by weight of the total amount of the component (a) and the component (b). The melt-kneading step is conducted by employing an extruder provided with an elongational flow zone which is a zone in which melt-kneading is performed while being allowed to undergo elongational flow, wherein the flow effect pressure drop is from 50 to 1,000 kg/cm 2 and is determined by subtracting the pressure value (P 0 ) of the molten resin in the elongational flow zone from the pressure value (P) of the molten resin before entering the elongational flow zone.

First claim

The invention claimed is:

1. A thermoplastic resin composition comprising:
(a) a polyphenylene sulfide resin, and
(b) a polyetherimide resin or a polyethersulfone resin,
wherein the thermoplastic resin composition contains 99 to 1% by weight of the component (a) and 1 to 99% by weight of the component (b) based on 100% by weight of the total amount of the component (a) and the component (b), and also satisfies the following conditions:
(i) a tensile elongation of 15% or more, wherein the tensile elongation is measured in accordance with ASTM-D638 under the conditions of a tension speed of 10 mm/minute and an ambient temperature of −20° C. using ASTM No. 4 dumbbell test pieces; and
(ii) a tensile creep strain of 2.8% or less, wherein the tensile creep strain is measured after the lapse of 100 hours from the beginning of a tensile creep test performed in accordance with ASTM-D2990 under the conditions of an ambient temperature of 80° C. and a tensile stress of 20 MPa using ASTM No. 4 dumbbell test pieces.

2. The thermoplastic resin composition according to claim 1 , which contains:
99 to 60% by weight of the polyphenylene sulfide resin (a), and
1 to 40% by weight of the polyetherimide resin or polyethersulfone resin (b).

3. The thermoplastic resin composition according to claim 1 , which further contains:
(c) a compound having, in a molecule, two or more groups selected from an epoxy group, an amino group, an isocyanate group, a hydroxy group, and an alkoxysilane group, wherein the amount of the component (c) is from 0.05 to 10 parts by weight based on 100 parts by weight of the total amount of the component (a) and the component (b).

4. The thermoplastic resin composition according to claim 3 , wherein the component (c) is an alkoxysilane compound having one or more groups selected from an epoxy group, an amino group, an isocyanate group, and a hydroxy group, and one or more alkoxysilane groups.

5. The thermoplastic resin composition according to claim 1 , wherein a melt viscosity of the polyphenylene sulfide resin (a) is 150 Pa·s or more under the conditions of 310° C. and a shear speed of 1,000/second.

6. The thermoplastic resin composition according to claim 1 , wherein a weight average molecular weight of the polyetherimide resin (b) is from 50,000 to 100,000.

7. A molded article comprising the thermoplastic resin composition according to claim 1 .

8. The molded article according to claim 7 , which is a member for fluid piping.

9. The thermoplastic resin composition according to claim 1 , wherein the composition is produced by a method including a melt-kneading step conducted by employing an extruder provided with an elongational flow zone which is a zone in which melt-kneading of the molten resin is performed while the molten resin is allowed to undergo elongational flow, wherein a flow effect pressure drop is from 50 to 1,000 kg/cm 2 , the flow effect pressure drop being determined by subtracting the pressure value (P 0 ) of the molten resin in the elongational flow zone from the pressure value (P) of the molten resin before entering the elongational flow zone.

Assignees

• Matsumoto Hideki
• Saito Kei
• Nakamura Naoya
• Toray Industries

Inventors

• Matsumoto Hideki
• Saito Kei
• Nakamura Naoya

Classifications

• C08L79/08 Primary

  Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors · CPC title

• Y10T428/139

  Open-ended, self-supporting conduit, cylinder, or tube-type article · CPC title

• C08L81/04 Primary

  Polysulfides · CPC title

• C08L81/06

  Polysulfones; Polyethersulfones · CPC title

• C08K5/54

  Silicon-containing compounds {(C08K5/0091 takes precedence)} · CPC title